diff --git a/index.js b/index.js
index 41e09be..2290e57 100644
--- a/index.js
+++ b/index.js
@@ -58,7 +58,7 @@ module.exports = function(symbol) {
       var sub2 = (i + 1) < len ? symbol.substr(i, 2).toLowerCase() : null;
       if (sub3 in SYMBOLS)
         name = sub3;
-      else if (sub2 in SYMBOLS)
+      else if (sub2 in SYMBOLS && symbol.substr(i + 1, 3).toLowerCase() !== "add")
         name = sub2;
       else if (c in SYMBOLS)
         name = c;
@@ -71,7 +71,6 @@ module.exports = function(symbol) {
       if (name === 'M' || name === 'ma' || name === 'maj')
         explicitMajor = true;
 
-
       i += name.length - 1;
       parsing = 'extension';
     } else if (parsing === 'extension') {
@@ -151,6 +150,10 @@ module.exports = function(symbol) {
             additionals.push('P11');
           else if (next === '13')
             additionals.push('M13');
+          else if (next === '4')
+            additionals.push('P4');
+          else if (next === '2')
+            additionals.push('M2');
           else {
             throw ParseError({
               title: 'Invalid token',
diff --git a/test/chords.js b/test/chords.js
index fb2da8b..0ee92a1 100644
--- a/test/chords.js
+++ b/test/chords.js
@@ -19,6 +19,8 @@ test('Parsing chops', function(t) {
   t.deepEqual(daccord('mi7'), ['P1', 'm3', 'P5', 'm7']);
   t.deepEqual(daccord('M'), ['P1', 'M3', 'P5']);
   t.deepEqual(daccord('Ma'), ['P1', 'M3', 'P5']);
+  t.deepEqual(daccord('Madd11'), ['P1', 'M3', 'P5', 'P11']);
+  t.deepEqual(daccord('madd11'), ['P1', 'm3', 'P5', 'P11']);
   t.deepEqual(daccord('M#5'), ['P1', 'M3', 'A5']);
   t.deepEqual(daccord('maj7'), ['P1', 'M3', 'P5', 'M7']);
   t.deepEqual(daccord('+'), ['P1', 'M3', 'A5']);